NMBLOOKUP problem

[Ondrej Hanak]

Hi samba gurus!
Can anybody explain this: 

I have WINS server set in smb.conf. When i use smbclinet -L name 
correctly WINS server answers on query and computer IP is sent back.
When i use nmblookup -U wins_server_ip name then name_query fails.

I have same problem in WinNT (SP6). Only one segment computers i can see 
in browse list. Yes i have WINS server set correctly. WINS server runs on 
WinNT Server. But i think that there is not problem in WINS server, cause 
smbclient -L works fine. 

Can anybody help me?! 
Thanx for any tips, guys!
O.H.